# Glossary of Terms

<table><thead><tr><th width="233"></th><th></th></tr></thead><tbody><tr><td>FastLane Labs</td><td>The organization behind Polygon Fast Lane.</td></tr><tr><td>Polygon FastLane (PFL)</td><td>The FastLane protocol deployment on the Polygon blockchain.</td></tr><tr><td>Searcher</td><td>A trader / bot operator specializing in "searching" for and executing MEV-related transactions. These are the primary "users" of the PFL protocol.</td></tr><tr><td>Validator</td><td>A special type of node operator who is nominated to add new blocks to the blockchain.</td></tr><tr><td>PFL Sentry</td><td>A heavily modified fork of Bor that runs the PFL auction.</td></tr><tr><td>PFL Relay</td><td>The RPC endpoint / API that searchers submit PFL bundles to. This endpoint takes care of distributing transactions to our global network of PFL Sentries.</td></tr><tr><td>PFL Bundle</td><td>A collection of exactly 2 transactions (the Opportunity Transaction, followed by the Searcher Transaction) that a Searcher can submit to the PFL Relay to participate in an auction.</td></tr><tr><td>Opportunity Transaction</td><td>This is the transaction that creates an "opportunity" on the blockchain for the searcher to trade behind, such as an oracle update.</td></tr><tr><td>Searcher Transaction</td><td>This is the transaction that registers the searchers bid in the auction, pays their success fee and contains parameters that are used to call the searchers callback if they win.</td></tr></tbody></table>